Life of the Saint
He was born in Nineveh (northern modern Iraq) in the 6th century.
He entered the monastery as a youth. Having perfected himself and succeeding in good deeds, he isolated himself in a desert cave to maintain silence, heeding only to himself and God.
After a number of years, God summoned him to serve as the ruling bishop of the Ninevite Church. However, after being tonsured, Saint Isaac did not remain very long at his cathedral. This occured because of the disobedience of a moneylender, who refused to act according to the Gospel.
The saint thought: "If they are not obeying God's directives in the Gospel, then what remains for me to do here?".
He returned to his beloved hermitage in the desert. There he lived in silence up to his death, abiding in deeds of self-denial, in struggles with the flesh and temptations of the demons.
Saint Isaac was a prolific writer, relying on his vast spiritual experiences. His instructions came to us in the form of 91 Ascetical Homilies. He reposed in the 7th century.
Apolytikion in the Plagal of the First Tone He that thundered on Sinai with saving laws for man hath also given thy writings as guides in prayer unto monks, O revealer of unfathomable mysteries; for having gone up in the mount of the vision of the Lord, thou wast shown the many mansions. Wherefore, O God-bearing Isaac, entreat the Saviour for all praising thee.
Kontakion in the Plagal of the Fourth Tone
As an ascetic and God-bearer great in righteousness and an instructor of monastics do we honour thee, thou revealer of things sacred, and our protector. But, O Isaac, since thou hast great boldness with the Lord, intercede with Him for all of us who sing thy praise and who cry to thee: Rejoice, O Father most wise in God.